Dell PowerConnect J-EX8216 Hardware Manual page 193

Figure 81: Do Not Grasp the Connector Edge
Never carry the line card while holding the faceplate with only one hand.
Do not rest any edge of a line card directly against a hard surface (see Figure
82 on page 177).
Figure 82: Do Not Rest the Edge of a Line Card on a Hard Surface
If you must rest a line card temporarily on an edge, place a cushion between
the edge and the surface.
Chapter 14: Routine Maintenance
177